Abstract: Disclosed are an inkjet print head and a method of manufacturing the same. An inkjet print head according to an aspect of the invention may include: an inkjet board having an ink passage therein; a cutting portion provided outside the ink passage of the inkjet board and having a cutting surface created by separation into head chip units of the inkjet board; and an auxiliary cutting portion provided from one surface of the cutting portion inwardly in a thickness direction of the inkjet board, and assisting the separation into head chip units of the inkjet board.

Abstract: There is provided an inkjet print head including a substrate member including an ink channel, a piezoelectric actuator formed on the substrate member, and a coating member formed on the piezoelectric actuator and including a photosensitive material.

Abstract: A method of forming a piezoelectric actuator on a vibration plate to provide a driving force to each of a plurality of pressure chambers includes forming a lower electrode on the vibration plate, forming a piezoelectric layer on the lower electrode at a position corresponding to each of the pressure chambers, forming a supporting pad on the lower electrode, the supporting pad contacting one end of the piezoelectric layer and extending away from the one end of the piezoelectric layer, forming an upper electrode extending from a top surface of the piezoelectric layer to a top surface of the supporting pad, and bonding the upper electrode to a driving circuit above the supporting pad to receive a voltage from the driving circuit.

Abstract: There is provided a poling method for a piezoelectric element, including performing preliminary poling of the piezoelectric element twice or more with different voltages and measuring conductance of the piezoelectric element with regard to respective voltage, establishing a relational expression between the voltage and the conductance of the piezoelectric element, calculating targeted conductance required to exhibit a targeted piezoelectric characteristic of the piezoelectric element, and selecting a targeted voltage level corresponding to the targeted conductance and performing final poling of the piezoelectric element at the targeted voltage level.

Abstract: There are provided a piezoelectric actuator, an inkjet head assembly, and a method of manufacturing the same. The piezoelectric actuator includes: upper and lower electrodes providing driving voltage; and a piezoelectric substance formed between the upper and lower electrodes through solidifying a liquid piezoelectric substance, and providing driving force to ink in each of a plurality of pressure chambers provided in an inkjet head, wherein the piezoelectric substance includes a plurality of branch portions individually provided on an upper portion of each of the plurality of pressure chambers and a large area portion integrally provided while being connected to each of the plurality of branch portions at one ends of the plurality of branch portions.

Abstract: A piezoelectric actuator includes upper and lower electrodes providing driving voltages and a piezoelectric film formed between the upper and lower electrodes and providing a driving force to ink in a plurality of pressure chambers formed on an inkjet print head, respectively. The piezoelectric film may include a plurality of basin parts individually formed on respective tops of the plurality of pressure chambers and a large-area part connected to the plurality of basin parts, respectively, at one ends of the plurality of basin parts and formed as a single body. The large-area part may include an etching groove formed on an extended line of a basin line partitioning the basin parts.

Abstract: There is provided an inkjet print head having a stable filter structure. The inkjet print head includes a vibration substrate including a first filter formed therein; and a channel forming substrate including a second filter and a pressure chamber formed therein, the second filter being connected to the first filter.

Abstract: There are provided a piezoelectric actuator, an inkjet head assembly, and a method of manufacturing the same. The piezoelectric actuator includes upper and lower electrodes providing a driving voltage; and a piezoelectric body provided between the upper and lower electrodes and providing driving force to ink within each of a plurality of pressure chambers provided in an inkjet head, wherein the piezoelectric body includes branch portions separately provided on an upper portion of each of the plurality of pressure chambers and a large area portion connected to one end of each of the plurality of branch portions and integrally formed, and a connective electrode pattern is provided on a portion of each of the upper electrodes corresponding to the large area portion.

Abstract: There are provided a piezoelectric device, an inkjet print head, and a method of manufacturing the same. The piezoelectric device includes piezoelectric ceramic powder containing 90 parts by weight or more to less than 100 parts by weight of Pb(Zr, Ti)O3, and more than 0 part by weight to 10 parts by weight or less of glass frit, based on 100 parts by weight of a piezoelectric substance composition for the piezoelectric device, wherein the glass frit contains 10 to 20 parts by weight of ZnO, based on 100 parts by weight of glass frit.

Abstract: An inkjet print head and a method for manufacturing the same are provided. The inkjet print head includes: an upper board having a pressure chamber; and a lower board including an upper silicon layer, an insulating layer, and a lower silicon layer, wherein the lower board includes a projection formed of the upper silicon layer and protruded into the interior of the pressure chamber in order to reduce the space of the pressure chamber, and a lower surface of the upper board and an upper surface of the lower silicon layer are fixed.

Abstract: There is provided a silicon substrate including: a first connection part connected to a manifold and having a first width of a first size; a second connection part connected to a pressure chamber and having a second width of a second size; and a restrictor part connecting the first connection part to the second connection part and having a third width of a third size smaller than the first size or the second size, wherein a boundary part connecting the restrictor part to the first connection part or the restrictor part to the second connection part is formed to be curved.

Abstract: There is provided an inkjet print head, including: a first substrate in which a first restrictor and a pressure chamber are formed; and a second substrate in which a manifold, a second restrictor, and a nozzle are formed, wherein the first restrictor is connected to the manifold and the second restrictor, and the second restrictor is connected to the first restrictor and the pressure chamber.

Abstract: There are provided a piezoelectric actuator, an inkjet head assembly, and a method of manufacturing the same. The piezoelectric actuator includes: upper and lower electrodes providing driving voltage; and a piezoelectric substance formed between the upper and lower electrodes through solidifying a liquid piezoelectric substance, and providing driving force to ink in each of a plurality of pressure chambers provided in an inkjet head, wherein the piezoelectric substance includes a plurality of branch portions individually provided on an upper portion of each of the plurality of pressure chambers and a large area portion integrally provided while being connected to each of the plurality of branch portions at one ends of the plurality of branch portions.

Abstract: There are provided a piezoelectric device, an inkjet print head, and a method of manufacturing the same. The piezoelectric device includes piezoelectric ceramic powder containing 90 parts by weight or more to less than 100 parts by weight of Pb(Zr, Ti)O3, and more than 0 part by weight to 10 parts by weight or less of glass frit, based on 100 parts by weight of a piezoelectric substance composition for the piezoelectric device, wherein the glass frit contains 10 to 20 parts by weight of ZnO, based on 100 parts by weight of glass frit.

Abstract: The present invention relates to an assembly method of an inkjet printhead assembly and an inkjet printhead assembly using the same, and more particularly, to an assembly method of an inkjet printhead assembly capable of securing a relative position between nozzles within a small error range in an inkjet printhead assembly having a side shooting head structure in which two or more head chips are bonded to a single bezel, and an inkjet printhead assembly using the same.

Abstract: Provided are a high-strength, high-manganese steel wire rod having excellent cold heading quality and not requiring spheroidizing and quenching-tempering treatments during manufacturing a bolt and a method of manufacturing a bolt using the steel wire rod. The method of manufacturing a steel wire rod includes heating a steel containing 12 to 25 wt % of Mn within a temperature range of 1100° C. to 1250° C., hot rolling the heated steel within a temperature range of 700° C. to 1100° C., and cooling the hot rolled steel to a temperature of 200° C. or less and cold caliber rolling or drawing to manufacture a steel wire rod.

Abstract: The present invention relates to a multilayered chip power inductor with high direct current superposition characteristics and high-frequency characteristics, particularly to a multilayered chip power inductor using as magnetic materials a magnetic sheet filled up with soft magnetic metal powder and a magnetic core. The present invention is to provide a multilayered chip power inductor achieving high inductance and direct current superposition characteristics.

Abstract: An inkjet print head and a method for manufacturing the same are provided. The inkjet print head includes: an upper board having a pressure chamber; and a lower board including an upper silicon layer, an insulating layer, and a lower silicon layer, wherein the lower board includes a projection formed of the upper silicon layer and protruded into the interior of the pressure chamber in order to reduce the space of the pressure chamber, and a lower surface of the upper board and an upper surface of the lower silicon layer are fixed.

Abstract: There is provided an inkjet print head that includes: an inkjet head plate with a plurality of head cells including ink passages where introduced ink is ejected through a nozzle by passing through a pressure chamber; and a piezoelectric actuator formed on the top of the inkjet head plate and formed at a position corresponding to the pressure chamber, wherein the area of at least one of the pressure chamber and the piezoelectric actuator is changed to make ejection characteristics of the ink ejected from the plurality of head cells uniform.

Abstract: Disclosed are an inkjet print head and a method of manufacturing the same. An inkjet print head according to an aspect of the invention may include: an inkjet board having an ink passage therein; a cutting portion provided outside the ink passage of the inkjet board and having a cutting surface created by separation into head chip units of the inkjet board; and an auxiliary cutting portion provided from one surface of the cutting portion inwardly in a thickness direction of the inkjet board, and assisting the separation into head chip units of the inkjet board.